Did a pcv on my 261 and it was nice and "clean" i believe it is Deve here that has the tech tip on converting to a pcv incuding correct one to use. I like them.but for originality you probably want to use draft tube.

1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
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1950 Chevy Coupe
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I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile